Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Trading Assets [Member] | Interest Rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 1,806,688	$ 1,665,965
Fair Value	47,780	29,391
Trading Assets [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	124,617	72,976
Fair Value	4,203	1,532
Trading Assets [Member] | Commodity contract [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	43,646	44,380
Fair Value	1,104	1,269
Trading Liabilities [Member] | Interest Rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,806,688	1,665,965
Fair Value	(50,145)	(30,886)
Trading Liabilities [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	116,751	65,649
Fair Value	(4,097)	(1,398)
Trading Liabilities [Member] | Commodity contract [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	43,770	44,256
Fair Value	(981)	(1,146)
Other Assets [Member] | Interest rate lock commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	418,136	271,530
Fair Value	2,689	958
Other Assets [Member] | Forward commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount		231,798
Fair Value		403
Other Assets [Member] | Purchased options (time deposit) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	103,475	104,582
Fair Value	2,228	2,715
Other Liabilities [Member] | Forward commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	249,866
Fair Value	(1,732)
Other Liabilities [Member] | Written options (time deposit) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	103,475	104,582
Fair Value	$ (2,228)	$ (2,715)